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What turf are you going to apply these to? Different grass has different requirments. For example, Centipede lawns should have no more than 9#'s nitrogen per 1,000 sq. ft. per year and ZERO phosperous and potassium. Its ideal pH is 5.3. St. Augustine, likes a 16-4-8 3 times a year. Its ideal pH is 7.1. Ammendments with micronutrients can be just as important as the macronutrients N-P-K.